package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart_2 {

    public static void main(String[] args) {
        //1.kafka连接配置信息
        Properties properties = new Properties();
        //连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.200.130:9092");

        //key 和 value的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");

        //消息组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group2");


        //2.创建消费者对象
        KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);

        //3.订阅主题
        kafkaConsumer.subscribe(Collections.singletonList("topic-first"));

        //4.拉取消息
        while (true){
            ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
            }
        }

    }
}
